在线客服系统源码开发实战总结：动态加载js文件实现粘贴一段js的sdk代码，直接引入插件效果

//动态加载css
function dynamicLoadCss(url){
    var head = document.getElementsByTagName('head')[0];
    var link = document.createElement('link');
    link.type='text/css';
    link.rel = 'stylesheet';
    link.href = url;
    head.appendChild(link);
}
//动态加载js文件
function dynamicLoadJs(url, callback){
    var head = document.getElementsByTagName('head')[0];
    var script = document.createElement('script');
    script.type = 'text/javascript';
    script.src = url;
    if(typeof(callback)=='function'){
        script.onload = script.onreadystatechange = function () {
            if (!this.readyState || this.readyState === "loaded" || this.readyState === "complete"){
                callback();
                script.onload = script.onreadystatechange = null;
            }
        };
    }
    head.appendChild(script);
}

<a href="javascript:KEFU.showPanel();">自定义按钮</a>
<script type='text/javascript'>
    (function(a, b, c, d) {
        let h = b.getElementsByTagName('head')[0];let s = b.createElement('script');
        s.type = 'text/javascript';s.src = c+"/static/js/kefu-front.js";s.onload = s.onreadystatechange = function () {
            if (!this.readyState || this.readyState === "loaded" || this.readyState === "complete") d(c);
        };h.appendChild(s);
    })(window, document,"https://gofly.v1kf.com",function(u){
        KEFU.init({
            KEFU_URL:u,
            KEFU_KEFU_ID: "taoshihan",
            KEFU_ENT: "5",
        })
    });
</script>